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12(x-3)=15
We move all terms to the left:
12(x-3)-(15)=0
We multiply parentheses
12x-36-15=0
We add all the numbers together, and all the variables
12x-51=0
We move all terms containing x to the left, all other terms to the right
12x=51
x=51/12
x=4+1/4
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